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So there are a few thing that can cause your issue but the most likely will be the thermal fuse or the door switch. You'll need to pull the dryer forward and remove the back sheet metal panel to check the fuse with a multimeter. Below is a video that shows you how to check the fuse. And below that link is a link to the actual fuse.
CLICK HERE for fuse video
CLICK HERE for fuse
Now if the fuse checks good, test power from the power cord to ensure you're getting 220 volts to the back of the dryer and not just 110 volts while you're back behind the oven. And if so, then you'll need to take the dryer apart and test the door switch because it sounds like it's bad if the start switch and fuse are good.
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